[Bug] lightbulb in diff editor with one window is always showing

Reproducible in vscode.dev or in VS Code Desktop?

• Not reproducible in vscode.dev or VS Code Desktop

Reproducible in the monaco editor playground?

• Not reproducible in the monaco editor playground

Monaco Editor Playground Link

link

Monaco Editor Playground Code

var originalModel = monaco.editor.createModel(
	"This line is removed on the right.\njust some text\nabcd\nefgh\nSome more text",
	"text/plain"
);
var modifiedModel = monaco.editor.createModel(
	"just some text\nabcz\nzzzzefgh\nSome more text\nThis line is removed on the left.",
	"text/plain"
);

var diffEditor = monaco.editor.createDiffEditor(
	document.getElementById("container"),
	{
		renderSideBySide: false,
		lightbulb: {enabled:false}
	}
);
diffEditor.setModel({
	original: originalModel,
	modified: modifiedModel,
});

Reproduction Steps

1. Set renderSideBySide: false, lightbulb: {enabled: false}
2. Hover over removed lines. They would be shown with the light bulb even though lightbulb is not enabled

Actual (Problematic) Behavior

Removed (red) lines are shown with the lightbulb

Expected Behavior

lightbulb is not shown

Additional Context

Tested on 0.37.0-dev.20230329

Start with the linked Monaco Editor Playground reproduction using a diff editor with renderSideBySide disabled and lightbulb.enabled set to false. Trace how hovering removed lines displays the lightbulb, then verify that the lightbulb is absent in this configuration while other diff behavior remains unchanged.